Nice job on the optimizations. People with older PCs will apreciate that and it's always good for a game that runs in the background to be efficient.
I think I'll check it out in the 1.0 release. I've enjoyed one of the earlier versions and wouldn't want to spoil the fun by playing every intermediate build.
I'm intrigued by your loot algorithms. DP table, heuristic flow? Never heard of those. All I know are simple loot drop tables :'D